BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Apr. 01, 2022
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 4,471	$ 4,103
IMS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,700	1,659
IMS | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,257	1,182
IMS | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	422	461
IMS | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,286	1,261
IMS | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	393	382
IMS | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	21	16
SAS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,655	1,517
SAS | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,454	1,342
SAS | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	188	165
SAS | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,022	880
SAS | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	620	627
SAS | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	13	10
CS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,163	963
CS | United States
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	791	625
CS | International
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	359	327
CS | Fixed-price
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	978	797
CS | Cost-reimbursable
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	172	155
CS | Intersegment
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	13	11
Prime contractor | IMS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,154	1,086
Prime contractor | SAS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	1,010	977
Prime contractor | CS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	807	656
Subcontractor | IMS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	525	557
Subcontractor | SAS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	632	530
Subcontractor | CS
Disaggregation of Revenue [Line Items]
Revenue from product sales and services	$ 343	$ 296